ST72345C4 datasheet(204/247 Pages) STMICROELECTRONICS

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Electrical characteristics

ST72344xx, ST2345xx

204/247

Doc ID 12321 Rev 6

13.4

Internal RC oscillator characteristics

Figure 88.

Typical RC frequency vs. RCCR

Table 92.

Internal RC oscillator characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fRC

Internal RC oscillator

frequency (1)

RCCR = FF (reset value), TA = 25 °C,

VDD =5V

625

kHz

RCCR = RCCR0 (2), TA = 25 °C, VDD = 5 V

1000

RCCR = FF (reset value), TA = 25 °C,

VDD =3V

612

RCCR = RCCR1(2), TA = 25 °C, VDD = 3 V

1000

ACCRC

Accuracy of Internal RC

oscillator with

RCCR=RCCR0 (2)

TA = 25 °C, VDD = 5 V

-1

TA = 25 °C, VDD = 4.5 to 5.5 V

(3)

-1

TA = 25 to +85 °C, VDD = 5 V

(3)

-3

TA = 25 to +85 °C, VDD = 4.5 to 5.5 V

(3)

-3.5

+3.5

TA = -40 to +25 °C, VDD = 4.5 to 5.5 V

(3)

-3

IDD(RC)

RC oscillator current

consumption

TA = 25 °C, VDD = 5 V

600 (3)

μA

tsu(RC)

RC oscillator setup time

TA = 25 °C, VDD = 5 V

10 (2)

μs

If the RC oscillator clock is selected, to improve clock stability and frequency accuracy, it is recommended to place a

decoupling capacitor, typically 100 nF, between the VDD and VSS pins as close as possible to the ST7 device.

It is also recommended to perform the calibration on board.

See Internal RC oscillator.

Expected results. Data based on characterization, not tested in production.

Typical Rc freq (MHz) = f(RCCR) @ 25°C

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

100

150

200

250

RCCR (decimal)

Rc @ 5V

Rc @ 3V

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